Intermittent feeding device for machine tools



H. CIPRIANO March 31, 1953 INTERMITTENT FEEDING DEVICE FOR MACHINE TOOLS Filed Oct. 19, 1.950

ATTOR N EY Patented Mar. 31, 195 3 INTERMITTENT FEEDING DEVICE FOR MACHINE TOOLS Henry Cipriano, Johnston, R. I., assignor to Special Machinery Corporation, a corporation of Rhode Island Application October 19, 1950, Serial No. 191,064 4 Claims. (01. 192-43) The present invention relates to feeding attachments for machine tools, and has particular reference to friction feeds for power presses and the like. I

The principal object of the invention is to provide a simple and effective construction for a reversible friction feed.

' Another object of the invention is to provide a reversible friction feed which comprises a manually reversible lock lever.

A further object of the invention is to provide a friction feed with a novel reversible lock lever of floating type.

With the above and other objects and advantageous features in view; the invention consists of a novel arrangement of parts more fully disclosed in the detailed description following, in conjunction with the accompanying drawings, and more specifically defined in the claims appended thereto.

In the drawings,

Fig. l is a perspective view of an illustrativ friction feedembodying the invention;

Fig. 2 is a side view thereof, the cover plate being removed and the lock lever being shown in section;

Fig. 3 is a perspective view of the lock lever and its spring parts; and

Fig. 4 is a perspective view of the actuating rocker arm. I I i It has been found desirable to provide a friction feed for power tools such as power presses, feed rolls and the like, which is accurately movable to close tolerances, and which may be readily reversed whenever desired. To this end, I

mount a floating lock lever on a driving wheel having an annular flange rim, to releasably resiliently lock to therim, and to be manually reversible for reversing the feed.

Referring to the drawings, the novel feed includes a driving wheel I I keyed to the drive shaft I2 of a power tool, the driving wheel having an annular flange rim l3. A rocker arm l4 having a hub and an actuating leader I6 is rotatably mounted on the shaft, the hub being offset to seat 7 within the driving wheel H, and being arcuately the lock lever assembly is within the arcuate seat [8.

The lock lever has a key slot 21 adjacent its upper end to receive the flange rim i3, and the lock lever is locked in place by a cover plate 28 which is fastened to the outer face of the hub I5. One upper edge 29 and an opposite lower edge 30 of the key slot respectively engage the upper and lower surfaces of therim I3 when the lock lever is manually swung to one side or the other to contact the contiguous pressure edge of the recess ILas shown in Fig. 2.

In operation, the rocker arm is reciprocated in the usual manner in timed relation to the power tool mechanism, the extent of the rocker arm movement being accurately set, as by an eccentric cam arrangement or the like. With the lock lever set as shown in Fig. 2, it is at an angle to the central line of the recess, and the downward swing of the rocker arm engages the pressure edge 28 with the contiguous side of the lock lever and imparts a turning movement which is transmitted to the driving shaft rim by the contacting key slot edges; When the rocker arm swings upwardly V the lock lever slides back with the return movement of the rocker arm, as the springs 26 yield to release the gripping action of the key slot edges on the driving wheel rim. Reversal of the driving wheel intermittent feed is readily accomplished by manually shifting the lock lever to the opposite side of the recess-whereupon the angular relation to the rocker arm is reversed and the pressure edge l9 becomes the means for imparting reverse turning movement to thedriving wheel rim. Since there is no slack or clearancebetween the key slot edges and the rim surfaces, a brake device for holding the driving wheel or the drive shaft against back-lash is not requiredybut may be applied in well-known manner'if desired,

' The rocker arm may be replaced by equivalent oscillating mechanism, as for example by a power gear, for adapting the friction feed to shapers, surface grinders, milling machines and the like, and the lock lever may be of greater length for mechanical reversing by means of a reciprocating machine part.

Although I have described a specific constructional embodiment of my invention, it is obvious that changes in the size, shape and arrangement of the parts may be readily made to suit different friction feed requirements, without departing from the spirit and the scope of the invention as defined in the appended claims.

I claim? 1 1. A friction feed device comprising a power shaft and a driving wheel keyed thereto, said driving wheel having a flange rim, a rocker arm having a hub rotatably mounted on said power shaft, said hub being seated within said rim and having a portion extending beyond said rim, the rocker arm extending outwardly from the: por tion beyond said rim, said rocker arm being perpendicular to the power shaft, said hub having.

an axial surface recess of arcuate form, and a lock lever of generally block form having. akey slot at one side and an end movably positioned in said recess, said lock lever being manually movable to selectively engage the recess: edges; a-

cover plate fastened to the outer face of the hub, whereby the lock lever maintains its selectively moved position, said lock lever key slot receiving the flange rim of the driving wheel, and spring. pressed rods seated in the lower end of the lock lever and urging said: lock lever outwardly in angular relation to the center line of said recess; whereby at least one edge of the key slotcontacts a surface of the: driving wheel rimwhen the rocker arm is turned in one direction and slides back over the rim when the-rocker armis turned in the opposite direction.

2'.- A: friction feed device comprising a power shaft and a driving wheel keyed thereto, said driving wheel having aflange: rim, a rocker arm having a hub rotatablymounted on said power shaft, said hub being seated within said rim and having a portion extending. beyond said rim the rocker arm extending! outwardly from the por .tion beyond said rim,.-sa'id rocker arm being perpendicular to the power shaft, said hub having an axial surface recess of arcuateform approximately at right angles to the'lineof said rocker arm, and a lock lever ofgenerally block formhavinga key slotatone side and an endmovably positioned in said recess, said locklever being manually movable to selectively engage the re cess edges, a cover plate fastened; to the-outer face of the hub, whereby the' lock lever maintains its selectivelymovedposition; said-locklever key slotreceiving the flange of the driving. wheel, and spring pressed rod means seated-- in the lower end of the lock lever and'urging; said lock lever outwardlyinangular relation tothe center line of said recess, whereby at least'one edge of the key slot contacts a surface of the driving wheel rim when the rocker arm-isturned in one direction and slides back over theriin when the rocker arm is turnedin theopposite direction.

3. A friction feed device comprising.- a power shaft and a driving wheel keyed thereto, said driving wheelhaving a flange rim, anoscillating means including a hub rotatably mounted on said power shaft. saidhub being seated witliin said rim andhaving a portion extending beyond said rim, a rocker, arm extending outwardly from the portion beyond said rim, said rocker arm being perpendicular to the power shaft, said hub having an axial surface recess of arcuate form, and a lock lever of generally block'form having a key slot at one side and an end movably positioned in said recess; said lock lever being manually movabl'eto selectively engage the recess edges, and a cover plate fastened to the outer face of the hub, whereby the lock lever maintains its selectively moved position, said lock lever key slot receiving"the'flange rim of the driving wheel, and spring pressed rod means seated in the lower end ofthe lock lever and urging said lock lever outwardl-y" in angular relation to the center line of said recess, whereby at least one edge of the key slot contacts a surface of the driving wheel rim when the rocker arm is turned in one direction and slides. back over the rim when the rocker arm is turned in the opposite direction.

4. A friction feed device comprising a power shaft and adriving wheel keyed thereto, said driving wheel having a flange rim, a rocker arm having a hub rotatably mounted on said power shaft,said hub being. seated within said rim and having a portion extending beyond said rim, whereby the inner face of saidhub iscontiguous to the inner face of said driving wheel, the rocker arm being perpendicular to thepower shaft, and a cover plate fastened to the outer face of the hub, whereby the lock lever maintains its selectively moved position, said hub having. anaxial surface recess of arcuate form, and a lock lever of generally block formhaving a key" slot atone sideand an endmova'bly postionedin said recess, said locklever being manually movable to selectively engage the recess edges, said lock lever key slot receiving the: flangerim ofthedriving wheel, and spring: pressed rod" means seated'i'n the lower end of the lock lever andurging' said lock lever outwardly in angular relation tothe center line of said recess,- whereby at least one edge of the key slot contacts surface of the driving wheel rim when the rocker arm is turned in one directionand slides back over the rimwhen the rocker arm is turned in the opposite direction. L r

CIPRIANGL REFERENCES CITE'fi:

The following references are of record inthe file of-th'is patent:

Number Name I Date 231,843 ohderdonk 1 Aug; 31, 1880 273,918 WalCOtt Mar. 13, 1883 360,740". Thomson Apr? 5', 1887 1,165,327 Faulklier Dec; 21, 1915 1,170,085" Maurseth- Feb; 1, 1916 

